CN101163170B - Feed condition and ring current testing apparatus - Google Patents
Feed condition and ring current testing apparatus Download PDFInfo
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- CN101163170B CN101163170B CN200610140911XA CN200610140911A CN101163170B CN 101163170 B CN101163170 B CN 101163170B CN 200610140911X A CN200610140911X A CN 200610140911XA CN 200610140911 A CN200610140911 A CN 200610140911A CN 101163170 B CN101163170 B CN 101163170B
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Abstract
The invention discloses a detection device for feeding state and ringing current and comprises four diodes VD1, VD2, VD3, VD4, two resistances R1,R2, two light coupled devices D1, D2, a constant current load and filtration current A and a filtration current B. In the invention, two detection contents of the feeding state and ringing current are realized through the same circuit module, with simple structure and high reliability; state output is high and low level signal which is convenient for detection; the invention can detect four states of feeding existence or nonexistence, straight polarity of feeding, reversed polarity of feeding and ringing current and can determine existence or nonexistence of feeding state and ringing current on a simulating user line according to determination of level two state output ends.
Description
Technical field
The present invention relates to the telephonic communication technical field, be specifically related to the checkout gear of a kind of analog line feed condition and ringing-current.
Background technology
The Subscriber Line Interface Circuit of stored-program control exchange provides substation required operating current by external supplying voltage of analog line or electric current (feed).Certain customers' line interface circuit has the polarity inversion function, when the polarity inversion function is meant TIP (plug tip), RING (plug ring) the two line voltage operate as normal of the subscribers feeder that is connected to substation, TIP voltage will be higher than RING line voltage, under the reversed polarity situation, voltage will be higher than TIP line voltage on the subscribers feeder RING line, and this function is used for providing fee charging signal to the charging phone.Feed have have or not, positive polarity and three states of reversed polarity.Ringing-current is the sinusoidal signal that is superimposed upon on the feed, is used to provide ring back tone, have have, no two states.
When analog line test or repeat circuit monitoring, the feed condition and the ringing-current that need to detect the analog subscriber line interface have or not.
Comprised feed condition detecting unit and ringing-current detecting unit among the Chinese patent CN200320113782 " loop trunks interface arrangement ", two functional modules are independent fully.The feed detecting unit is to utilize voltage comparator to come the level of comparison TIP line and RING line, and then draws the feed polarity inversion state that has that it's too late.Two functional modules are independent fully, and circuit is comparatively complicated, and circuit parameter is difficult for adjusting.Wherein the ringing-current detection is by stopping direct current, rectification, filtering, and by optocoupler output ringing-current condition indicative signal, this signal is that frequency is the square-wave signal of 25HZ, is not easy to detect then.
Comprised feed condition detecting unit and ringing-current detecting unit among the Chinese patent CN02272770 " the switchable interface circuit of user/relaying ", two unit also are two independent parts, adopt an optocoupler to be achieved respectively.Be used for the only conducting when TIP line level is higher than RING line level of feed condition detecting unit, be output as low level, otherwise be high level.Be lower than RING line level or because open circuit when causing both level consistent at TIP line level, be output as high level, as seen, for opening circuit or situation circuit such as feed disappearance can't detect, and unification thinks that feed is the reversed polarity state, is unfavorable for being used in and carries out fault detect and location in the analog line functional test.The ringing-current detecting unit is coupled to the optocoupler input by electric capacity with ringing signal, and when on the subscribers feeder ringing signal being arranged, high level is then exported in periodically conducting of optocoupler when output square-wave signal, no ringing-current.The square-wave signal of output is compared with simple level signal when existing for ringing-current, is not easy to detect.This circuit is formed simple, clear in structure, but state-detection is incomplete.
Through retrieval, in the detection method of existing feed condition and ringing-current and the device, these two functions by two independently circuit realize, uses and to owe convenient, and the ringing-current output signal is square-wave signal, also be not easy to very much the back level and detect.
Summary of the invention
In order to overcome problems of the prior art, the present invention is directed to analog line feed condition and ringing-current and detect, a kind of feed condition simple and reliable for structure and the checkout gear of ringing-current have been proposed.
The present invention specifically is achieved in that
A kind of feed condition and ringing-current checkout gear comprise:
Four diodes (VD1, VD2, VD3, VD4), two resistance (R1, R2), optocoupler (D1, D2), Constant Current Load and two filter circuits (A, B);
The TIP end connects the negative terminal of first diode (VD1) and the anode of the 3rd diode (VD3), and the negative terminal of the 3rd diode (VD3) is connected to the anode of optocoupler (D1) input side by resistance (R1);
The RING end connects the negative terminal of second diode (VD2) and the anode of the 4th diode (VD4), and the negative terminal of the 4th diode (VD4) connects the anode that optocoupler (D2) input is surveyed by resistance (R2);
The anode of first diode (VD1) is connected with the anode of second diode (VD2) and is connected to the output of Constant Current Load, the negative terminal of two optocouplers (D1, D2) input side links to each other and is connected to the input of Constant Current Load, the anode of two optocouplers (D1, D2) outlet side is connected to power supply respectively, one optocoupler (D1) outlet side negative terminal connects a state output end, insert a filter circuit (A) between while and the ground, another optocoupler (D2) outlet side negative terminal connects another state output end, simultaneously inserts another filter circuit (B) between over the ground.
Feed-48V voltage or 18～20mA electric current and two diodes that are connected the arbitrary end of analog line, an anode is connected, and a negative terminal is connected, and guarantees no matter feed is positive polarity or negative polarity, and each wherein has only a conducting constantly.
The electric current that input side is flow through in described optocoupler requirement is 15～20mA.
Described Constant Current Load circuit guarantees to flow through the current constant of circuit about 20mA;
Constant Current Load all can adopt constant-current source circuit to be realized.
Described constant-current source circuit can adopt a NPN type triode, at its collector electrode and a base stage resistance in parallel, simultaneously seal in another resistance at emitter, the current collection of triode is the anode of Constant Current Load very, and the other end of the resistance that is in series with emitter is the negative terminal of Constant Current Load.
Described filter circuit all can adopt the RC filter circuit to be realized.
In the present invention, utilize same circuit module to realize feed condition and these two detections of ringing-current content, simple in structure, the reliability height; State is output as the high-low level signal, is convenient to detect; Can detect that feed has or not, feed positive polarity, feed reversed polarity and ringing-current have or not four kinds of states, by the judgement to two state output end level, feed condition and the ringing-current that can judge on the analog line have or not.
Description of drawings
Fig. 1 is the circuit diagram of device of the present invention.
Embodiment
Below in conjunction with accompanying drawing device of the present invention is described in detail.
Device of the present invention is by four diode VD1, VD2, VD3, VD4, resistance R 1, R2, and optocoupler D1, D2, Constant Current Load and filter circuit A and filter circuit B form.
The TIP line connects the negative terminal of the first diode VD1 and the anode of the 3rd diode VD3, and the negative terminal of the 3rd diode VD3 is connected to the anode of optocoupler D1 input side by resistance R 1.The RING end connects the negative terminal of the second diode VD2 and the anode of the 4th diode VD4, the negative terminal of the 4th diode VD4 connects the anode that optocoupler D2 input is surveyed by resistance R 2, the anode of the first diode VD1 is connected with the anode of the second diode VD2 and is connected to the output of crossing current load, and the negative terminal that optocoupler D1, D2 input is surveyed links to each other and is connected to the input of crossing current load.The anode of optocoupler D1, D2 outlet side is connected to power supply, and optocoupler D1 outlet side negative terminal connection status output 1 inserts filter circuit A between while and the ground.Optocoupler D2 outlet side negative terminal connection status output 2 simultaneously inserts filter circuit B between over the ground.
When feed condition detected, when TIP line and RING line did not have the feed of adding or open circuit, state output end 1 and state output end 2 were low level.
When TIP line level is higher than RING line level, when feed is positive polarity, two conductings of second and third diode VD2, VD3, and by Constant Current Load formation current circuit, make optocoupler D1 conducting, state output end 1 output high level, this moment, optocoupler D2 ended state output end 2 output low levels.
When TIP line level is lower than RING line level, when feed is negative polarity, two conductings of first, fourth diode VD1, VD4, and by Constant Current Load formation current circuit, make optocoupler D2 conducting, state output end 2 output high level, this moment, optocoupler D1 ended state output end 1 output low level.
When having ringing-current on the analog line, because ringing-current is the AC signal about 25Hz, therefore can make two optocoupler D1, D2 alternate conduction, and then make state output end 1 and state output end 2 be square wave about 25Hz, the two-way output signal is after filtration behind wave circuit A and the filter circuit B, the steady direct current that square wave can be converted to, promptly state output end 1 and state output end 2 are high level.
As seen, the state of state output end 1 and 2 two output signals of state output end has just reflected that the feed polarity and the ringing-current of analog line have or not:
State output end 1 is height, when state output end 2 is low, shows that analog line is a feed condition that TIP line level is higher than RING line level;
State output end 1 is low a, state output end 2 when high, shows that analog line is a feed condition, and RING line level is higher than TIP line level;
State output end 1 is height, when state output end 2 is high, shows that analog line is the ringing-current state.
State output end 1 and state output end 2 are all when hanging down, and show that both not having feed does not have ringing-current yet, and when being used for functional test, this situation has reflected the fault of analog way.
Apparatus of the present invention be input as analog line (two wires), promptly TIP line and RING line are connected with input TIP end (plug tip), the RING end (plug ring) of device respectively.Importing feed is-48V voltage or 18～20mA electric current, connects two diodes of the arbitrary end of analog line, and an anode is connected, and a negative terminal is connected, and guarantees no matter feed is positive polarity or negative polarity, and each wherein has only a conducting constantly.For example, when the TIP terminal voltage is higher than the RING end, have only the 3rd diode VD3 that connects the TIP end and the second diode VD2 conducting that is connected the RING end, and the first diode VD1 and the 4th diode VD4 remain off.
Resistance R 1, R2 connect the anode of the 3rd diode VD3 and the 4th diode VD4 negative terminal and optocoupler input side.The input feed is-the 48V direct current, and ringing-current is for being superimposed upon on the feed, and peak-to-peak value is the sinusoidal ac signal of 90V, so the input terminal voltage excursion is bigger.Resistance R 1, R2 can effectively play the effect of dividing potential drop, current limliting, the interference of inhibition burr.Select suitable resistance R 1, R2, when operate as normal, can effectively share the voltage on the loop, effectively reduce the carrying voltage of optocoupler (reverse breakdown voltage) and Constant Current Load device, be convenient to the type selecting of optocoupler and Constant Current Load device; Effectively absorb the high-frequency interferencing signal on the circuit simultaneously, guarantee the stable of state output.
The output of optocoupler D1, D2 is connected to the input of Constant Current Load jointly, and the input signal that the outside is comparatively abominable is converted to the high-low level signal of standard, realizes that simultaneously the photoelectricity between input, output two parts is isolated.The electric current that the conducting of optocoupler requires to flow through input side is 15～20mA, so during design circuit, should guarantee that electric current satisfies the requirement that optocoupler stablize conducting in the loop on the one hand, and when input oppositely ended, reverse voltage should be lower than breakdown voltage rating on the other hand.
The no matter positive half cycle or the negative half period of feed polarity and ringing signal, the electric current that flows through subscribers feeder flows into from the Constant Current Load anode all the time, and negative terminal flows out.The current constant that the Constant Current Load circuit is guaranteed to flow through circuit is used to simulate the real work machine even load of answering at home and abroad about 20mA, prevent since on the subscribers feeder voltage fluctuation in a big way cause the fluctuation of input current.Subscribers feeder powers on and flows through conference and cause exchanger side to detect the subscribers feeder short trouble, judges by accident.Constant Current Load can adopt comparatively simple constant-current source circuit to be realized.For example, adopt a NPN type triode,, seal in the method for another resistance simultaneously at emitter, can constitute a simple Constant Current Load at its collector electrode and a base stage resistance in parallel.The current collection of triode is the anode of Constant Current Load very, and the other end of the resistance that is in series with emitter is the negative terminal of Constant Current Load.
Filter circuit is connected in parallel between state output end and the ground, and the 25Hz square-wave signal conditioning that is used for two condition output when ringing-current detected externally only provides high and low level signal for permanent steady direct current, for carrying out feed condition and ringing-current has or not differentiation in the outside.Filter circuit can adopt comparatively simple RC filter circuit to be realized.
Claims (6)
1. feed condition and ringing-current checkout gear is characterized in that, comprising:
Four diodes (VD1, VD2, VD3, VD4), two resistance (R1, R2), optocoupler (D1, D2), Constant Current Load and two filter circuits (A, B);
The TIP end connects the negative terminal of first diode (VD1) and the anode of the 3rd diode (VD3), and the negative terminal of the 3rd diode (VD3) is connected to the anode of first optocoupler (D1) input side by first resistance (R1);
The RING end connects the negative terminal of second diode (VD2) and the anode of the 4th diode (VD4), and the negative terminal of the 4th diode (VD4) connects the anode of second optocoupler (D2) input side by second resistance (R2);
The anode of first diode (VD1) is connected with the anode of second diode (VD2) and is connected to the output of Constant Current Load, the negative terminal of two optocouplers (D1, D2) input side links to each other and is connected to the input of Constant Current Load, the anode of two optocouplers (D1, D2) outlet side is connected to power supply respectively, first optocoupler (D1) outlet side negative terminal connects first state output end, insert a filter circuit (A) between while and the ground, second optocoupler (D2) outlet side negative terminal connects second state output end, simultaneously inserts another filter circuit (B) between over the ground.
2. the checkout gear of feed condition as claimed in claim 1 and ringing-current is characterized in that:
Feed-48V voltage or 18～20mA electric current and two diodes that are connected the arbitrary end of analog line, an anode is connected, and a negative terminal is connected, and guarantees no matter feed is positive polarity or negative polarity, and each wherein has only a conducting constantly.
3. the checkout gear of feed condition as claimed in claim 1 and ringing-current is characterized in that:
The electric current that input side is flow through in described optocoupler (D1, D2) requirement is 15～20mA.
4. the checkout gear of feed condition as claimed in claim 1 and ringing-current is characterized in that:
Described Constant Current Load circuit guarantees to flow through the current constant of circuit about 20mA;
Constant Current Load all can adopt constant-current source circuit to be realized.
5. the checkout gear of feed condition as claimed in claim 4 and ringing-current is characterized in that:
Described constant-current source circuit can adopt a NPN type triode, at its collector electrode and a base stage resistance in parallel, simultaneously seal in another resistance at emitter, the current collection of triode is the anode of Constant Current Load very, and the other end of the resistance that is in series with emitter is the negative terminal of Constant Current Load.
6. the checkout gear of feed condition as claimed in claim 1 and ringing-current is characterized in that:
Described filter circuit all can adopt the RC filter circuit to be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610140911XA CN101163170B (en) | 2006-10-12 | 2006-10-12 | Feed condition and ring current testing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610140911XA CN101163170B (en) | 2006-10-12 | 2006-10-12 | Feed condition and ring current testing apparatus |
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| Publication Number | Publication Date |
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| CN101163170A CN101163170A (en) | 2008-04-16 |
| CN101163170B true CN101163170B (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610140911XA Active CN101163170B (en) | 2006-10-12 | 2006-10-12 | Feed condition and ring current testing apparatus |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5561772B2 (en) * | 2010-06-02 | 2014-07-30 | Ｎｅｃアクセステクニカ株式会社 | Call signal generator |
| CN101895640B (en) * | 2010-07-23 | 2015-06-03 | 中兴通讯股份有限公司 | Method and system for saving energy of user interface circuit |
| CN112637426B (en) * | 2020-12-17 | 2023-04-28 | 四川灵通电讯有限公司 | High-reliability low-cost ringing current detection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442694A (en) * | 1994-04-12 | 1995-08-15 | Dialogic Corporation | Ring tone detection for a telephone system |
| CN2575917Y (en) * | 2002-08-22 | 2003-09-24 | 深圳市明亚科技有限公司 | Loudspeaker box |
| CN2669513Y (en) * | 2003-12-31 | 2005-01-05 | 港湾网络有限公司 | Loop relay interface device |
-
2006
- 2006-10-12 CN CN200610140911XA patent/CN101163170B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442694A (en) * | 1994-04-12 | 1995-08-15 | Dialogic Corporation | Ring tone detection for a telephone system |
| CN2575917Y (en) * | 2002-08-22 | 2003-09-24 | 深圳市明亚科技有限公司 | Loudspeaker box |
| CN2669513Y (en) * | 2003-12-31 | 2005-01-05 | 港湾网络有限公司 | Loop relay interface device |
Non-Patent Citations (3)
| Title |
|---|
| CN 2669513 Y,全文. |
| 仲兆楠,李全虎.基于89C51的小型程控交换机.内蒙古大学学报（自然科学版）33 2.2002,33(2),205-208. |
| 仲兆楠,李全虎.基于89C51的小型程控交换机.内蒙古大学学报(自然科学版)33 2.2002,33(2),205-208. * |
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